The range of insulation options

There are numerous alternatives when it comes to choosing insulation materials. They differ in thermal efficiency and in offering certain important properties like resistance to fire and avoidance of ozone depleting chemicals. Some also lose much their insulating efficiency if affected by moisture. So, at the outset it is advisable to understand something about the most readily available insulants. The thermal efficiency of an insulant is denoted by its thermal conductivity, termed lambda value, measured in W/mK. The thermal conductivity of a material 'is the amount of heat transfer per unit of thickness for a given temperature difference' (Thomas, R. (ed.) (1996) Environmental Design, E & FN Spon, p. 10). Technically it is a measure of the rate of heat conduction through 1 cubic metre of a material with a 1°C temperature difference across the two opposite faces. The lower the value the more efficient the material.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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